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drivers: sensors: Add Si7006 temperature/humidity sensor driver

Adds driver for Silicon Labs Si7006 chip.

Signed-off-by: Vaishali Pathak <vaishali@electronut.in>
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Pathak94 authored and MaureenHelm committed Apr 4, 2019
1 parent ccbb18c commit 0923ae4172f904ae5858cbfa8fd5a81c0116724b
@@ -48,6 +48,7 @@ add_subdirectory_ifdef(CONFIG_PMS7003 pms7003)
add_subdirectory_ifdef(CONFIG_QDEC_NRFX qdec_nrfx)
add_subdirectory_ifdef(CONFIG_TEMP_NRF5 nrf5)
add_subdirectory_ifdef(CONFIG_SHT3XD sht3xd)
add_subdirectory_ifdef(CONFIG_SI7006 si7006)
add_subdirectory_ifdef(CONFIG_STTS751 stts751)
add_subdirectory_ifdef(CONFIG_SX9500 sx9500)
add_subdirectory_ifdef(CONFIG_TH02 th02)
@@ -121,6 +121,8 @@ source "drivers/sensor/qdec_nrfx/Kconfig"

source "drivers/sensor/sht3xd/Kconfig"

source "drivers/sensor/si7006/Kconfig"

source "drivers/sensor/stts751/Kconfig"

source "drivers/sensor/sx9500/Kconfig"
@@ -0,0 +1,5 @@
# SPDX-License-Identifier: Apache-2.0

zephyr_library()

zephyr_library_sources_ifdef(CONFIG_SI7006 si7006.c)
@@ -0,0 +1,11 @@
#
# Copyright (c) 2019 Electronut Labs
#
# SPDX-License-Identifier: Apache-2.0
#

config SI7006
bool "Si7006 Temperature and Humidity Sensor"
depends on (I2C && HAS_DTS_I2C)
help
Enable I2C-based driver for Si7006 Temperature and Humidity Sensor.
@@ -0,0 +1,162 @@
/*
* Copyright (c) 2019 Electronut Labs
*
* SPDX-License-Identifier: Apache-2.0
*/

#include <sensor.h>
#include <kernel.h>
#include <device.h>
#include <init.h>
#include <string.h>
#include <sys/byteorder.h>
#include <sys/__assert.h>
#include <logging/log.h>
#include <i2c.h>
#include <logging/log.h>
#include <stdio.h>
#include <stdlib.h>
#include "si7006.h"

LOG_MODULE_REGISTER(si7006, CONFIG_SENSOR_LOG_LEVEL);

struct si7006_data {
struct device *i2c_dev;
u16_t temperature;
u16_t humidity;
};

/**
* @brief function to get relative humidity
*
* @return int 0 on success
*/
static int si7006_get_humidity(struct device *i2c_dev,
struct si7006_data *si_data)
{
int retval;
u8_t hum[2];

retval = i2c_burst_read(i2c_dev, DT_INST_0_SILABS_SI7006_BASE_ADDRESS,
SI7006_MEAS_REL_HUMIDITY_MASTER_MODE, hum, sizeof(hum));

if (retval == 0) {
si_data->humidity = (hum[0] << 8) | hum[1];
} else {
LOG_ERR("read register err");
}

return retval;
}

/**
* @brief function to get temperature
*
* @return int 0 on success
*/

static int si7006_get_temperature(struct device *i2c_dev,
struct si7006_data *si_data)
{
u8_t temp[2];
int retval;

retval = i2c_burst_read(i2c_dev, DT_INST_0_SILABS_SI7006_BASE_ADDRESS,
SI7006_MEAS_TEMP_MASTER_MODE, temp, sizeof(temp));

if (retval == 0) {
si_data->temperature = (temp[0] << 8) | temp[1];
} else {
LOG_ERR("read register err");
}

return retval;
}

/**
* @brief fetch a sample from the sensor
*
* @return 0
*/
static int si7006_sample_fetch(struct device *dev, enum sensor_channel chan)
{
int retval;
struct si7006_data *si_data = dev->driver_data;

retval = si7006_get_temperature(si_data->i2c_dev, si_data);
if (retval == 0) {
retval = si7006_get_humidity(si_data->i2c_dev, si_data);
}

return retval;
}

/**
* @brief sensor value get
*
* @return -ENOTSUP for unsupported channels
*/
static int si7006_channel_get(struct device *dev, enum sensor_channel chan,
struct sensor_value *val)
{
struct si7006_data *si_data = dev->driver_data;

if (chan == SENSOR_CHAN_AMBIENT_TEMP) {

s32_t temp_ucelcius = ((17572 * (s32_t)si_data->temperature)
/ 65536) * 10000;

val->val1 = temp_ucelcius / 1000000;
val->val2 = temp_ucelcius % 1000000;

LOG_DBG("temperature = val1:%d, val2:%d", val->val1, val->val2);

return 0;
} else if (chan == SENSOR_CHAN_HUMIDITY) {

s32_t relative_humidity = (((125 * (s32_t)si_data->humidity)
/ 65536) - 6) * 1000000;

val->val1 = relative_humidity / 1000000;
val->val2 = relative_humidity % 1000000;

LOG_DBG("humidity = val1:%d, val2:%d", val->val1, val->val2);

return 0;
} else {
return -ENOTSUP;
}
}

static const struct sensor_driver_api si7006_api = {
.sample_fetch = &si7006_sample_fetch,
.channel_get = &si7006_channel_get,
};

/**
* @brief initiasize the sensor
*
* @return 0 for success
*/

static int si7006_init(struct device *dev)
{
struct si7006_data *drv_data = dev->driver_data;

drv_data->i2c_dev = device_get_binding(
DT_INST_0_SILABS_SI7006_BUS_NAME);

if (!drv_data->i2c_dev) {
LOG_ERR("i2c master not found.");
return -EINVAL;
}

LOG_DBG("si7006 init ok");

return 0;
}

static struct si7006_data si_data;

DEVICE_AND_API_INIT(si7006, DT_INST_0_SILABS_SI7006_LABEL, si7006_init,
&si_data, NULL, POST_KERNEL, CONFIG_SENSOR_INIT_PRIORITY, &si7006_api);
@@ -0,0 +1,28 @@
/*
* Copyright (c) 2019 Electronut Labs
*
* SPDX-License-Identifier: Apache-2.0
*/

#ifndef _SI7006_H
#define _SI7006_H

/* Si7006 register addresses */
#define SI7006_MEAS_REL_HUMIDITY_MASTER_MODE 0xE5
#define SI7006_MEAS_REL_HUMIDITY_NO_MASTER_MODE 0xF5
#define SI7006_MEAS_TEMP_MASTER_MODE 0xE3
#define SI7006_MEAS_TEMP_NO_MASTER_MODE 0xF3
#define SI7006_READ_OLD_TEMP 0xE0
#define SI7006_RESET 0xFE
#define SI7006_WRITE_HUMIDITY_TEMP_CONTR 0xE6
#define SI7006_READ_HUMIDITY_TEMP_CONTR 0xE7
#define SI7006_WRITE_HEATER_CONTR 0x51
#define SI7006_READ_HEATER_CONTR 0x11
#define SI7006_READ_ID_LOW_0 0xFA
#define SI7006_READ_ID_LOW_1 0x0F
#define SI7006_READ_ID_HIGH_0 0xFC
#define SI7006_READ_ID_HIGH_1 0xC9
#define SI7006_FIRMWARE_0 0x84
#define SI7006_FIRMWARE_1 0xB8

#endif /* _SI7006_H */
@@ -0,0 +1,18 @@
#
# Copyright (c) 2019, Electronut Labs
#
# SPDX-License-Identifier: Apache-2.0
#
---
title: Si7006 Temperature and Humidity sensor
version: 0.1

description: >
This is a representation of Si7006 Temperature and Humidity sensor
inherits:
!include i2c-device.yaml

properties:
compatible:
constraint: "silabs,si7006"
@@ -166,6 +166,12 @@
#define DT_INST_0_SENSIRION_SHT3XD_BUS_NAME ""
#endif

#ifndef DT_INST_0_SILABS_SI7006_LABEL
#define DT_INST_0_SILABS_SI7006_LABEL ""
#define DT_INST_0_SILABS_SI7006_BASE_ADDRESS 0x40
#define DT_INST_0_SILABS_SI7006_BUS_NAME ""
#endif

#ifndef DT_INST_0_ST_LIS2DS12_LABEL
#define DT_INST_0_ST_LIS2DS12_LABEL ""
#define DT_INST_0_ST_LIS2DS12_BUS_NAME ""
@@ -24,6 +24,7 @@ CONFIG_MAX44009=y
CONFIG_MCP9808=y
CONFIG_MPU6050=y
CONFIG_SHT3XD=y
CONFIG_SI7006=y
CONFIG_SX9500=y
CONFIG_TEMP_NRF5=y
CONFIG_TH02=y

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